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Making a simple LED music controller?
Making a simple LED music controller?
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Old 13th January 2020, 12:15 AM   #11
Refugee1 is offline Refugee1  United Kingdom
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The audio should go to the third terminal on the pot.
While you have got the wires off the gate try touching between the tab on the IRF840 and the gate with a wet finger. The LEDs should light up and then dim slowly. 12 volts will not bight you.
You can also drive the gate with a meter on diode test range.
Once the pot is connected correctly the LED will dim quickly.
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Old 13th January 2020, 04:23 AM   #12
c4ppucino is offline c4ppucino
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Quote:
Originally Posted by Refugee1 View Post
The audio should go to the third terminal on the pot.
While you have got the wires off the gate try touching between the tab on the IRF840 and the gate with a wet finger. The LEDs should light up and then dim slowly. 12 volts will not bight you.
You can also drive the gate with a meter on diode test range.
Once the pot is connected correctly the LED will dim quickly.
Hi, not sure if I follow. If I connect the wires on the pot to the 2 furthermost posts, wouldn't the resistor value be constant (in this case, 50k)? Let's say the terminals are labeled A-B-C, which terminals should I connect the wires and the gate and drain to?

As of now (without changing anything from the picture above):
- when I plug in power, the LED lights up. I can't dim it by adjusting the pot
- when I plug in the audio jack, the LED dims. I can control the brightness a bit by adjusting the pot
- when I set the pot to barely dim light, and I play music, the LED lights up, but stays that way. When I pause the music, the LED stays that way for about 2-3 seconds, then go back dim

I built (soldered) it based on this schematic I found on youtube, with AUX input in place of the mic.
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Old 13th January 2020, 04:30 AM   #13
c4ppucino is offline c4ppucino
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Quote:
Originally Posted by MAAC0 View Post
Try a 10K pot and find out the resistor ratio needed for making an attenuator pad.
Remove also the Mic Bias resistor. (10K on the left perhaps, It should be connected to the supply).
Hi, thank you for the reply. I tried using a 50k pot, and the LED still blink randomly, even without anything connecting to it but the pot's terminal. Havent tried removing the 10K resistor on the PCB yet. I tried to find the route leading to the power supply, but I just couldn't. I just can't see which goes where on the PCB....

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Originally Posted by The Peasant View Post
It's nicer when you have different LEDs responding to different frequencies:

The Electronic Peasant's LED Color Organ Page

Just leave out the first transistor stage.

Take care,
Doug
Hi, thanks for the link, but that one seems too complicated for me. I only know basic stuffs like resistors, PCB, soldering, etc
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Old 13th January 2020, 11:07 AM   #14
Refugee1 is offline Refugee1  United Kingdom
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The pot is wired wrong.
You need to use all three terminals.
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